*{
	margin:0;
	padding:0;
	box-shadow: border-box;
}
.electrical-equipement-top{
	width: 850px;
	margin:auto;
}.nav::after{
	display: table;
	content: "";
	clear: both;
}
.nav li{
	list-style: none;
	float: left;
	padding:10px;
	width: 100px;
	text-align: center;
	cursor: pointer;
}
.nav .active{
	background: pink;
	color: #fff;
}
.main > div{
	display: none;
}
.main > div.active{
	display: block;
}